Yeah, I think I have the same thing. A friend of mine complained that he could not start a game (after starting the game in lobby, he'd get the load screen with [no text] in the game mode field. After that, the UI would occasionally load, but the game wouldn't start. And then came the Unhandled Error-message - which crashes too. After trying to launch a game with him I got the same thing too, which is creepy. Reinstalling did not help, and now I cannot start a game either online or vs computer. Anyway, here is the crash log from my last attempt at skirmish:
debug: Loading module '\000/lua/common/buffdefinitions.lua\000'
debug: Loading module '\000/lua/common/buffdefbasestats.lua\000'
debug: Loading module '\000/lua/common/buffdefmisc.lua\000'
debug: Loading module '\000/lua/common/citadelupgrades.lua\000'
debug: Loading module '\000/lua/common/abilitydefinitions.lua\000'
debug: Loading module '\000/lua/sim/entity.lua\000'
debug: Loading module '\000/lua/sim/vizmarker.lua\000'
debug: Loading module '\000/lua/utilities.lua\000'
debug: Loading module '\000/lua/sim/buff.lua\000'
debug: Loading module '\000/lua/sim/buffaffects.lua\000'
debug: Loading module '\000/lua/sim/ability.lua\000'
debug: Loading module '\000/lua/common/validateability.lua\000'
debug: Loading module '\000/lua/common/commonutils.lua\000'
debug: Loading module '\000/lua/ui/game/hud_msgs_failure.lua\000'
debug: Loading module '\000/lua/ui/uiutil.lua\000'
debug: Loading module '\000/lua/lazyvar.lua\000'
debug: Loading module '\000/lua/maui/layouthelpers.lua\000'
debug: Loading module '\000/lua/maui/effecthelpers.lua\000'
debug: Loading module '\000/lua/maui/bitmap.lua\000'
debug: Loading module '\000/lua/maui/control.lua\000'
debug: Loading module '\000/lua/maui/group.lua\000'
debug: Loading module '\000/lua/maui/text.lua\000'
debug: Loading module '\000/lua/maui/multilinetext.lua\000'
debug: Loading module '\000/lua/ui/game/module_pause.lua\000'
debug: Loading module '\000/lua/ui/prefs.lua\000'
debug: Loading module '\000/lua/options/optionslogic.lua\000'
debug: Loading module '\000/lua/maui/button.lua\000'
debug: Loading module '\000/lua/maui/dragger.lua\000'
debug: Loading module '\000/lua/maui/edit.lua\000'
debug: Loading module '\000/lua/maui/checkbox.lua\000'
debug: Loading module '\000/lua/maui/scrollbar.lua\000'
debug: Loading module '\000/lua/maui/cursor.lua\000'
debug: Loading module '\000/lua/maui/border.lua\000'
debug: Loading module '\000/lua/maui/itemlist.lua\000'
debug: Loading module '\000/lua/user/skins/layouts.lua\000'
debug: Loading module '\000/lua/maui/movie.lua\000'
debug: Loading module '\000/lua/common/lootdefinitions.lua\000'
debug: Loading module '\000/lua/common/achievements/hema01_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hepa01_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hgsa01_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hoak_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hqueen_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hrook_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hsedna_achievementdata.lua\000'
debug: Loading module '\000/lua/common/achievements/hvampire_achievementdata.lua\000'
debug: Loading module '\000/units/heroes/hema01/hema01_abilities.lua\000'
debug: Loading module '\000/units/heroes/hepa01/hepa01_abilities.lua\000'
debug: Loading module '\000/units/heroes/hgsa01/hgsa01_abilities.lua\000'
debug: Loading module '\000/units/heroes/hgsa01/hgsa01mine01_abilities.lua\000'
debug: Loading module '\000/units/heroes/hoak/hoak_abilities.lua\000'
debug: Loading module '\000/units/heroes/hoculus/hoculus_abilities.lua\000'
debug: Loading module '\000/units/heroes/hqueen/hqueen_abilities.lua\000'
debug: Loading module '\000/units/heroes/hrook/hrook_abilities.lua\000'
debug: Loading module '\000/units/heroes/hsedna/hsedna_abilities.lua\000'
debug: Loading module '\000/units/heroes/hvampire/hvampire_abilities.lua\000'
debug: Loading module '\000/units/minions/highpriest/highpriest01_abilities.lua\000'
debug: Loading module '\000/units/minions/highpriest/highpriest02_abilities.lua\000'
debug: Loading module '\000/units/minions/highpriest/highpriest03_abilities.lua\000'
debug: Loading module '\000/units/minions/highpriest/highpriest04_abilities.lua\000'
debug: Loading module '\000/units/reinforcements/rpriest/rpriest01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagcooldown01/unbflagcooldown01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagdamageamp01/unbflagdamageamp01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagexperience01/unbflagexperience01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflaghealthregen01/unbflaghealthregen01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagmanaregen01/unbflagmanaregen01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagmaxhealth01/unbflagmaxhealth01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagmaxmana01/unbflagmaxmana01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagwavesizes01/unbflagwavesizes01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbflagwavespeed01/unbflagwavespeed01_abilities.lua\000'
debug: Loading module '\000/units/un/b/unbidol01/unbidol01_abilities.lua\000'
debug: Loading module '\000/characters/angel/angel_character.lua\000'
debug: Loading module '\000/characters/archer/archer_character.lua\000'
debug: Loading module '\000/characters/archer/archer_movie_character.lua\000'
debug: Loading module '\000/characters/bird/bird_character.lua\000'
debug: Loading module '\000/characters/ent/ent_character.lua\000'
debug: Loading module '\000/characters/flag/flag_character.lua\000'
debug: Loading module '\000/characters/giant/giant_character.lua\000'
debug: Loading module '\000/characters/giant/giant_r_character.lua\000'
debug: Loading module '\000/characters/highpriest/highpriest02_character.lua\000'
debug: Loading module '\000/characters/highpriest/highpriest03_character.lua\000'
debug: Loading module '\000/characters/highpriest/highpriest04_character.lua\000'
debug: Loading module '\000/characters/highpriest/highpriest_character.lua\000'
debug: Loading module '\000/characters/king/king_character.lua\000'
debug: Loading module '\000/characters/leopard_rider/leopard_rider_character.lua\000'
debug: Loading module '\000/characters/mage/mage_character.lua\000'
debug: Loading module '\000/characters/mage/magefire_character.lua\000'
debug: Loading module '\000/characters/minotaur/minotaur_character.lua\000'
debug: Loading module '\000/characters/minotaur/minotaur_movie1_character.lua\000'
debug: Loading module '\000/characters/minotaur/minotaur_movie2_character.lua\000'
debug: Loading module '\000/characters/minotaurcaptain/minotaurcaptain02_character.lua\000'
debug: Loading module '\000/characters/minotaurcaptain/minotaurcaptain03_character.lua\000'
debug: Loading module '\000/characters/minotaurcaptain/minotaurcaptain04_character.lua\000'
debug: Loading module '\000/characters/minotaurcaptain/minotaurcaptain_character.lua\000'
debug: Loading module '\000/characters/oak/oak_character.lua\000'
debug: Loading module '\000/characters/priest/priest_character.lua\000'
debug: Loading module '\000/characters/priest/priest_movie_character.lua\000'
debug: Loading module '\000/characters/queen/queen_character.lua\000'
debug: Loading module '\000/characters/queen/queen_open_character.lua\000'
debug: Loading module '\000/characters/queen/queen_open_movie_character.lua\000'
debug: Loading module '\000/characters/rook/rook_character.lua\000'
debug: Loading module '\000/characters/serpent/serpent_character.lua\000'
debug: Loading module '\000/characters/siegearcher/siegearcher02_character.lua\000'
debug: Loading module '\000/characters/siegearcher/siegearcher03_character.lua\000'
debug: Loading module '\000/characters/siegearcher/siegearcher04_character.lua\000'
debug: Loading module '\000/characters/siegearcher/siegearcher_character.lua\000'
debug: Loading module '\000/characters/sniper/sniper_character.lua\000'
debug: Loading module '\000/characters/sniper/sniperfury_character.lua\000'
debug: Loading module '\000/characters/spirit/spirit_character.lua\000'
debug: Loading module '\000/characters/trebuchet/hrooktreb_character.lua\000'
debug: Loading module '\000/characters/trebuchet/trebuchet_character.lua\000'
debug: Loading module '\000/characters/unclean_beast/unclean_beast_character.lua\000'
debug: Loading module '\000/characters/unclean_beast/unclean_beast_movie_character.lua\000'
debug: Loading module '\000/characters/vampire/vampire_character.lua\000'
debug: Loading module '\000/characters/vampire_lord/vampire_lord_character.lua\000'
debug: Loading module '\000/characters/waridol/waridol_character.lua\000'
debug: Loading module '\000/characters/whiptail/whiptail_character.lua\000'
debug: Loading module '\000/characters/yeti/yeti_character.lua\000'
debug: Loading module '\000/lua/common/powerupdefinitions.lua\000'
debug: Loading module '\000/lua/common/items/achievement_items.lua\000'
debug: Loading module '\000/lua/common/items/artifact_items.lua\000'
debug: Loading module '\000/lua/common/items/boot_items.lua\000'
debug: Loading module '\000/lua/common/items/chest_items.lua\000'
debug: Loading module '\000/lua/common/items/consumable_items.lua\000'
debug: Loading module '\000/lua/common/items/generals_items.lua\000'
debug: Loading module '\000/lua/common/items/glove_items.lua\000'
debug: Loading module '\000/lua/common/items/helm_items.lua\000'
debug: Loading module '\000/lua/common/items/ring_items.lua\000'
info: Active mods in sim: \000{ }
debug: Loading module '\000/lua/common/armortypes.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/goals/advancegoals.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/goals/itemgoals.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/goals/killgoals.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/goals/mastergoals.lua\000'
debug: Loading module '\000/lua/sim/ai/aiglobals.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/goals/squadgoals.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/attackactions.lua\000'
debug: Loading module '\000/lua/sim/ai/aiutilities.lua\000'
debug: Loading module '\000/lua/common/validateinventory.lua\000'
debug: Loading module '\000/lua/common/validateshop.lua\000'
debug: Loading module '\000/lua/ui/game/achievement.lua\000'
debug: Loading module '\000/lua/sim/scenarioutilities.lua\000'
debug: Loading module '\000/lua/sim/ai/aiabilityutilities.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/captureactions.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/ctfactions.lua\000'
debug: Loading module '\000/lua/sim/ai/aictfutilities.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/miscactions.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/moveactions.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/shopactions.lua\000'
debug: Loading module '\000/lua/sim/ai/aishoputilities.lua\000'
debug: Loading module '\000/lua/sim/ai/aichatglobals.lua\000'
debug: Loading module '\000/lua/common/validateupgrade.lua\000'
debug: Loading module '\000/lua/game.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/squadlocationactions.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/useachievementitemsactions.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/actions/useitemsactions.lua\000'
debug: Loading module '\000/units/heroes/hema01/hema01_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hepa01/hepa01_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hgsa01/hgsa01_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hoak/hoak_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hqueen/hqueen_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hrook/hrook_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hsedna/hsedna_aiactions.lua\000'
debug: Loading module '\000/units/heroes/hvampire/hvampire_aiactions.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/buffsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/ctfsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/distancesensors.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/goapsystemsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/nearbysensors.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/unitstatussensors.lua\000'
debug: Loading module '\000/lua/sim/ai/heroes/sensors/warstatussensors.lua\000'
debug: Loading module '\000/units/heroes/hsedna/hsedna_aisensors.lua\000'
debug: Loading module '\000/units/heroes/hema01/hema01_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hepa01/hepa01_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hgsa01/hgsa01_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hoak/hoak_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hoculus/hoculus_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hqueen/hqueen_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hrook/hrook_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hsedna/hsedna_aiblueprint.lua\000'
debug: Loading module '\000/units/heroes/hvampire/hvampire_aiblueprint.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/goals/basicgoals.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/actions/capturepointactions.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/actions/ctfflagactions.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/actions/laneactions.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/actions/strongholdactions.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/actions/structuredefensefortactions.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/capturepointsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/ctfsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/herostatussensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/lanesensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/strongholdsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/structuredefensefortsensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/structuresensors.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/sensors/warstatussensors.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/assassinate.lua\000'
debug: Loading module '\000/lua/sim/ai/squad.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/attackstronghold.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/attackstructuredefensefort.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/capturepoint.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/ctfcapture.lua\000'
debug: Loading module '\000/lua/sim/carryableflag.lua\000'
debug: Loading module '\000/lua/sim/forgeunit.lua\000'
debug: Loading module '\000/lua/sim/unit.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/ctfdefend.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/defendflag.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/defendstronghold.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/defendstructuredefensefort.lua\000'
debug: Loading module '\000/lua/sim/ai/squads/pushlane.lua\000'
debug: Loading module '\000/lua/sim/stattracking.lua\000'
debug: Loading module '\000/lua/sim/achievements.lua\000'
debug: Loading module '\000/lua/scenarioenvironment.lua\000'
info: Loading save file: \000/maps/MAP12/MAP12_save.lua
info: Loading script file: \000/maps/MAP12/MAP12_script.lua
debug: Loading module '\000/lua/sim/conquest.lua\000'
debug: Loading module '\000/lua/sim/victory.lua\000'
debug: Loading module '\000/lua/common/preload.lua\000'
debug: Loading module '\000/lua/sim/simcamera.lua\000'
debug: Loading module '\000/lua/system/singleevent.lua\000'
debug: Loading module '\000/lua/gamecolors.lua\000'
debug: Loading module '\000/lua/sim/conquestglobals.lua\000'
warning: Setting pathfinder depth to - 12000
debug: Loading module '\000/lua/aibrain.lua\000'
debug: Loading module '\000/lua/sim/ai/brainplanner.lua\000'
debug: Loading module '\000/lua/sim/ai/herogoap.lua\000'
debug: Loading module '\000/lua/sim/skill.lua\000'
debug: Loading module '\000/lua/common/validateskill.lua\000'
debug: Loading module '\000/lua/sim/ai/heroaiaction.lua\000'
debug: Loading module '\000/lua/sim/ai/heroaigoal.lua\000'
debug: Loading module '\000/lua/sim/ai/heroaisensor.lua\000'
debug: Loading module '\000/lua/sim/ai/heroaiworldstate.lua\000'
debug: Loading module '\000/lua/sim/ai/strategicgoap.lua\000'
debug: Loading module '\000/lua/sim/ai/strategicaction.lua\000'
debug: Loading module '\000/lua/sim/ai/strategicgoal.lua\000'
debug: Loading module '\000/lua/sim/ai/strategicsensor.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/laneasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategicasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/flagasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/strongholdasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/enemyasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/herobrainasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/friendlyasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/teambrainasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/structuredefensefortasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategic/assets/ctfflagasset.lua\000'
debug: Loading module '\000/lua/sim/ai/strategicworldstate.lua\000'
debug: Loading module '\000/lua/sim/structureunit.lua\000'
debug: Loading module '\000/lua/sim/characterunit.lua\000'
debug: Loading module '\000/lua/sim/character.lua\000'
debug: Loading module '\000/lua/factions.lua\000'
debug: Loading module '\000/lua/sim/herounit.lua\000'
debug: Loading module '\000/lua/sim/inventory.lua\000'
info: Sim::Create() crashed: attempt to get as string a nil value
stack traceback:
